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HVAC will not turn on

My air conditioning unit will not turn on. The technician that came out said that the freon was only half full and he found a small leak outside. Can this be the cause of the unit not turning on at all? It wouldn't blow any air. I have had 5 service calls in the past 6 months for the upstairs and downstairs units not coming on when they should. The technicians that respond are all from the same company and are answering a call for a warranty company. They have told me they couldn't find anything wrong until this call. When the heat wouldn't come on periodically they found nothing that would cause it.

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If the freon pressure gets low then the low pressure cutout switch kills the low voltage to the thermostat and the unit will not run.

Posted on Mar 12, 2009

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I have a Lg Multi v heat pump. we had a freon leak, evacuated system and recharged but now can't get any heat or cool out of it. It runs continuously and shows no codes. pipe is really hot ne


I'm a retired and certified HVAC&R Technician. You only indicate that you "evacuated the system and recharged it." If that is all you did, then you have problems. Where was the Freon leak? What was done to repair the Freon leak? When you evacuated the system, did you then pull it down to 28 inches of vacuum? If so, did you ensure it held 28 inches of vacuum for a minimum of 30 minutes? Then, did you charge the system with 250 psi of Nitrogen and ensure it held for 30 minutes? If so, did you then release the Nitrogen and pull another 28 inches of vacuum prior to filling the system with Freon? These are the steps I used EACH AND EVERY TIME I EVACUATED A SYSTEM; and I only had a problem ONCE where the copper tubing got extremely HOT and the system would not HEAT or COOL. Found out the reversing valve was stuck half way. Had to replace the reversing valve. Good luck.

Nov 22, 2014 | LG Air Conditioners

1 Answer

My corona air conditioner inverter does not produce hot air


these are all in one units, some of them are made like smaller central units and some of these are separate ac and heat units. the heat in the separate ones is run off of a heat strip in the unit it's self the ones that are made like a central unit reverse the flow of the freon in the system to draw the heat from outside. this is not something you can repair very easily yourself. most places require because of the freon that you have a certified HVAC technician to work on them.

Feb 22, 2013 | Air Conditioners

1 Answer

How do i recharge freon for me Friedrich KM18J30A-3 window unit?


only a certified HVAC technician has the license to carry and use the freon used in home A/C units. it's not like the car units we can do ourselves.

Jul 14, 2012 | Friedrich QuietMaster KM18L30 Wall/Window...

1 Answer

How do I recharge the freon in my unit? model is 38CKB060300


Hello, freon should be charged by a hvac technician with a epa card. But the way you charge it in is hook up the manifold gauges to the unit tjen take the yellow and hook it up to your refrigerant bottle. If this is a R-22 unit then you add vapor refrigerant to the low side of the system untill your superheat is correct if it is a fixed orifice system, however if it is a txv system then you chek the subooling. If it is a 410a system then the same principle applies however you flip the cylinder upside down and add liquid refrigerant through the low side a little at a time here is a link that shows you proper charging methods http://www.air-conditioning-and-refrigeration-guide.com/charging-air-conditioning-systems.html.

May 27, 2011 | Carrier 38CKC036 Air Conditioner

1 Answer

My Amanda wall unit keeps freezing up. Cleaned filter and coils, please advise. Thanks, Gilbert


If a AC unit starts to freeze up, then that is a sure sign that it is low on freon. A wall unit is harder to add freon to since those units generally do not have Shrader valves to purge or add freon. It is sort of like your refridgerator in that the freon is sealed in the factory and to add , a technician has to cut the evaporator tube and add a valve, then add freon, pinch the tube off and seal it once the correct pressure is adjusted.

I would say that somehow your unit has developed a leak, and will get worse.

see:http://real-estate-agents.com/tips/hvac/maintain-air-conditioner/

Jan 23, 2011 | Amana PTC123B35AE Air Conditioner

1 Answer

How do i hook my manifold gauges to my residental condensing unit to check pressures


The AC manifold gauges set have the three chambers: the low pressure chamber (left side), utility chamber (middle), and the high pressure chamber (right side).

When technicians connect the HVAC manifold gauge to the air conditioner units, he connects the low pressure side of air conditioner unit to low pressure gauge side.

If he wants to read the pressure in discharge line he connects the high pressure gauge hose to the air conditioner high pressure side.

The utility port (the middle chamber) is a place you connect the hose to vacuum pump, recovery units or add or remove refrigerant from AC units.

Air conditioning gauges is used to measure air conditioner units pressure within closed-system to evaluate or troubleshoot the AC units. Gauges manifold set is the most frequently used item when it comes to refrigerant or pressure.

Air conditioning gauge set allows the HVAC technician to check AC units operating pressures, transfer AC refrigerant, pressure test system, purge the system with nitrogen, and perform other necessary tasks.

The gauges manifold set includes the hoses, the manifold, the valves, the compound gauge (low pressure gauges) and high pressure gauge.

Jul 24, 2010 | Air Conditioners

1 Answer

How do i get the freeon in the ac its not getting cold


Air Conditioners don't 'Use' freon per se. A common fallacy is the thinking that if "It's not getting cold, then it needs freon." If your unit lost freon, it has a leak and adding freon will only be a very short term fix.

If you're certain that you need freon, you'll have to take the unit to a certified HVAC technician. EPA regulations make it nearly impossible for the average handyman to service A/C units, since the freon must be handled in a very specific way with equipment not generally available to the average owner, was well as R-12 freon gas which can be bought only by licensed HVAC technicians.

However, there are many other problems that are far more likely to be the cause of no cooling than loss of freon. It could be something as simple as dirty condenser coils (you'd be surprised how common it is that a simple cleaning of these coils will 'fix' a non-working window A/C), to a defective thermostat switch, to other defective switches/controls.

Unless it's a very obvious leak, I always suspect a loss of freon LAST on my list of possible cause of non-cooling in these units.

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2 Answers

Dometic duo therm does not cool or heat...


it should never have to be recharged unless there is a leak. so you should isolate the leak with dye injectable into the system w/ the freon and correct it, then fully recharge system.

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